AU540312B2 - Optical focusing device - Google Patents

Optical focusing device

Info

Publication number
AU540312B2
AU540312B2 AU72111/81A AU7211181A AU540312B2 AU 540312 B2 AU540312 B2 AU 540312B2 AU 72111/81 A AU72111/81 A AU 72111/81A AU 7211181 A AU7211181 A AU 7211181A AU 540312 B2 AU540312 B2 AU 540312B2
Authority
AU
Australia
Prior art keywords
focusing device
optical focusing
optical
focusing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
AU72111/81A
Other languages
English (en)
Other versions
AU7211181A (en
Inventor
Martinus Petrus Maria Bierhoff
Jacobus Petrus Josephus Heemskerk
Kornelis Antonie Schouhamer Immink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of AU7211181A publication Critical patent/AU7211181A/en
Application granted granted Critical
Publication of AU540312B2 publication Critical patent/AU540312B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Lens Barrels (AREA)
AU72111/81A 1980-06-27 1981-06-24 Optical focusing device Expired - Fee Related AU540312B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8003729A NL8003729A (nl) 1980-06-27 1980-06-27 Inrichting voor optische scherpstelling.
NL8003729 1980-06-27

Publications (2)

Publication Number Publication Date
AU7211181A AU7211181A (en) 1982-01-07
AU540312B2 true AU540312B2 (en) 1984-11-08

Family

ID=19835527

Family Applications (1)

Application Number Title Priority Date Filing Date
AU72111/81A Expired - Fee Related AU540312B2 (en) 1980-06-27 1981-06-24 Optical focusing device

Country Status (11)

Country Link
US (1) US4354103A (es)
JP (1) JPS5730810A (es)
AT (1) AT371277B (es)
AU (1) AU540312B2 (es)
CA (1) CA1160874A (es)
DE (1) DE3124219A1 (es)
ES (1) ES503348A0 (es)
FR (1) FR2485781A1 (es)
GB (1) GB2078947B (es)
IT (1) IT1137923B (es)
NL (1) NL8003729A (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418405A (en) * 1981-06-29 1983-11-29 Rca Corporation Lens positioning controller for optical playback apparatus
US4580900A (en) * 1982-04-02 1986-04-08 Eaton Corporation Auto focus alignment and measurement system and method
US4615621A (en) * 1982-04-02 1986-10-07 Eaton Corporation Auto-focus alignment and measurement system and method
JPS58179947A (ja) * 1982-04-15 1983-10-21 Olympus Optical Co Ltd 光情報再生装置における合焦検出方式
DE3219503C2 (de) * 1982-05-25 1985-08-08 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Vorrichtung zum selbsttätigen Fokussieren auf in optischen Geräten zu betrachtende Objekte
WO1985000457A1 (fr) * 1983-07-06 1985-01-31 Matsushita Electric Industrial Co., Ltd. Photo-capteur
EP0236503B1 (en) * 1985-09-10 1992-01-22 Mitsubishi Denki Kabushiki Kaisha Optical head device
US4712887A (en) * 1985-12-20 1987-12-15 Dazar Corporation Optical system for fast access optical data storage device
EP0346479B1 (en) * 1987-10-28 1994-01-05 Oki Electric Industry Company, Limited Optical head
US5251011A (en) * 1989-06-28 1993-10-05 Dainippon Screen Manufacturing Co., Ltd. Displacement detection system
US5663554A (en) * 1995-01-17 1997-09-02 Agfa Division, Bayer Corporation Weak lens focus adjusting mechanism based upon thickness of scanned material and imagesetter using same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2309888A1 (fr) * 1975-04-30 1976-11-26 Thomson Brandt Dispositif optique de projection et lecteur optique comportant un tel dispositif
FR2330062A1 (fr) * 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
JPS606014B2 (ja) * 1976-10-07 1985-02-15 ソニー株式会社 情報検出装置
NL186121C (nl) * 1977-12-16 1990-09-17 Mitsubishi Electric Corp Automatisch focusseerapparaat.

Also Published As

Publication number Publication date
GB2078947A (en) 1982-01-13
CA1160874A (en) 1984-01-24
AT371277B (de) 1983-06-10
US4354103A (en) 1982-10-12
JPS5730810A (en) 1982-02-19
NL8003729A (nl) 1982-01-18
IT1137923B (it) 1986-09-10
AU7211181A (en) 1982-01-07
FR2485781A1 (fr) 1981-12-31
DE3124219A1 (de) 1982-02-04
IT8122545A0 (it) 1981-06-24
ES8204868A1 (es) 1982-05-01
GB2078947B (en) 1984-05-16
ES503348A0 (es) 1982-05-01
ATA280181A (de) 1982-10-15

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